The built environment of the U.S. has changed remarkably little in the past 40 years, and we are paying for this stasis today with our housing crisis from not building enough housing supply, our congested and crumbling roadways, our lack of transit infrastructure investment (NYC subway has been frozen in time for almost a century practically, and all we can celebrate elsewhere are a handful of light rail lines that usually sit in traffic with the cars), we've voted to defund our schools, and have refused to expand our public healthcare system to those younger than 65 as originally planned in order to protect private insurance industries.
The only improvement the west has made in the last 40 years was figuring out how to move a greater proportion of its wealth into the hands of the few, and iPhones I guess.
Even ignoring the phrasing that could be read as claiming no major wars since the medieval era, we don't have to go so far back. I mean, sure, the Cultural Revolution killed more Chinese people than WW2 and the Korean war did combined, but that's still eleven million or so Chinese people dead in those conflicts.
> they haven't been involved in any major wars and yet still dictate policy in the region.
As far as I know, the last major war China fought in was when they invaded Vietnam in 1979 after Vietnam had invaded Cambodia (Chinese ally) to get rid of the Khmer Rouge (the same regime that killed everyone who wore glasses because they may have been reading too much)...